correct me if I'm wrong, but unless you see the GM docs , you don't know which 4 spd. you have , the trim tag code M20 just denotes that it was a 4 spd.
just what I thought ?? I could very well be wrong??
JJ said
Mar 8, 2010
Well that souns real mean.. I like it
rabbit64cs said
Mar 8, 2010
Muncie
M20 is wide ratio
M21 close ratio
M22 close ratio same as M21 BUT straight cut gears that are bullet proof,,,sort of...
The M22 is the noisy on that you hear in 2 Lane Blacktop in the 55....NICE !!!!
JJ said
Mar 8, 2010
so the M22 would be better cause it's Heavy Duty Thx again
68sd said
Mar 8, 2010
for Camaro
Manual 4-speed Transmissions
M20 was the generic RPO for a 4-speed transmission.
For lower performance applications (L6, 307, 327, and L65 350), the Saginaw 4-speed was utilized. It used a cast iron case. For higher performance applications (LM1 350, SS350, big blocks, and Z28) the Muncie 4-speed was used. It used an aluminum case and different gear ratios from the Saginaw 4-speed.
The primary Muncie 4-speed transmission was marketed under RPO M20. The close-ratio version of the Muncie 4-speed was RPO M21 and the heavy-duty close-ratio 4-speed was RPO M22. M21 and M22 transmissions were limited to specific high performance models.
The Camaro 4-speed manual transmissions ratios for both Muncie and Saginaw, with other Muncie data, are as follows:
There were two 3-speed manual transmission options available in the 67-69 Camaros.
The base manual transmission for non-high-performance models and 67-8 SS350's was the Saginaw 3-speed, M15. If no transmission option was selected, this was the tranmission installed. It was column shifted unless a console or RPO M11 floor shift was selected. An exception to this was SS350's, which required the HD 3-speed to get a floor shift.
The heavy-duty 3-speed manual transmission, made by Borg-Warner, was available as RPO M13 for 67-68 SS models. For SS350 models, M13 was optional (but required if you wanted a floor shift). For SS396 models, M13 was a required option if another transmission was not ordered. In 1969, the heavy-duty 3-speed was supplied by Muncie and changed to RPO MC1. It was available on LM1 and SS models. For the LM1, it was a required option if another transmission was not ordered. For 69 SS models, the HD 3-speed trans was included in the SS package.
Borg-Warner M13 67-68 T16-1 2.41 1.57* 1.00 * noted as 1.59 in 68 Muncie MC1 69 3911940 2.42 1.58 1.00
-- Edited by 68sd on Monday 8th of March 2010 08:30:47 PM
JJ said
Mar 8, 2010
Thx that is awsome info " you rock "
rabbit64cs said
Mar 8, 2010
so, saying all that, M22 would be stamped on the trim tag ?? if say a 68 Beaumont was built as such from the factory?? sure would be great if that was the case...
This debate was discussed about late 70's Camaro's a while back?
rabbit64cs said
Mar 8, 2010
very cool , thanks for the lesson !!
rabbit64cs said
Mar 8, 2010
a while back , a member from Victoria posted these original option sheets . Kinda interesting that the mis-spelled M20 option ( N20 ) for a 4 spd.
68sd said
Mar 8, 2010
for 1969 (a M21 car would be rare for a Beaumont ,how many of the 43 would have got it? ive seen 2 M20 69SDs and a MC1
-- Edited by 68sd on Monday 8th of March 2010 10:51:47 PM
for Camaro
Manual 4-speed Transmissions
M20 was the generic RPO for a 4-speed transmission.For lower performance applications (L6, 307, 327, and L65 350), the Saginaw 4-speed was utilized. It used a cast iron case. For higher performance applications (LM1 350, SS350, big blocks, and Z28) the Muncie 4-speed was used. It used an aluminum case and different gear ratios from the Saginaw 4-speed.
The primary Muncie 4-speed transmission was marketed under RPO M20. The close-ratio version of the Muncie 4-speed was RPO M21 and the heavy-duty close-ratio 4-speed was RPO M22. M21 and M22 transmissions were limited to specific high performance models.
The Camaro 4-speed manual transmissions ratios for both Muncie and Saginaw, with other Muncie data, are as follows:
Manual 3-speed Transmissions
There were two 3-speed manual transmission options available in the 67-69 Camaros.The base manual transmission for non-high-performance models and 67-8 SS350's was the Saginaw 3-speed, M15. If no transmission option was selected, this was the tranmission installed. It was column shifted unless a console or RPO M11 floor shift was selected. An exception to this was SS350's, which required the HD 3-speed to get a floor shift.
The heavy-duty 3-speed manual transmission, made by Borg-Warner, was available as RPO M13 for 67-68 SS models. For SS350 models, M13 was optional (but required if you wanted a floor shift). For SS396 models, M13 was a required option if another transmission was not ordered.
In 1969, the heavy-duty 3-speed was supplied by Muncie and changed to RPO MC1. It was available on LM1 and SS models. For the LM1, it was a required option if another transmission was not ordered. For 69 SS models, the HD 3-speed trans was included in the SS package.
-- Edited by 68sd on Monday 8th of March 2010 08:30:47 PM
-- Edited by 68sd on Monday 8th of March 2010 10:51:47 PM